Mechanism for actuating the slay of weaving looms



June 11, 1935. P. BREDDIN ET AL 2,004,306

MECHANISM FOR ACTUATING THE SLAY OF WEAVING LOOMS Filed April 8, 1953 3 M flllorney In 0022 Zors the rear limit ofits stroke is there the r in its travel, which is occasionedby this Patented June 11, 1935 I J 2,004,306 I p l .MECHANISM F OR ACTUATING SLAY .7 V l F WEAVINGLLOOMS V PaulrBreddin and Otto wittmerst' colog ne on 1' the-Rhine, Germany Application April s, 1933, Serial No; 665,213 In Germany June10,'1932 'Ihe present invention relates to a for actuating. the slay of weaving looms and relates to such "actuating mechanisms in which the oscillatory movement of 1 the. slay is brought about by means of two pairs of cranks, arranged on the common and by double levers, which are pivotally attached to each of the slay swords and whoselever arms of the cranks. i

In (the. .actuatingfimechanisms of this kind known heretofore,*the double levers articulated to the slay swords were equal-armed and so shaped that the fulcrum is in a straight line with the two driving pins of the connecting rods. Thus the movemento-f theslay is such that not only at pause double crank drive and which is to facilitate the unimpedeol passing of the shuttle through the shed, but also an equally long pause at the forward end of the stroke of the slay. Hence the time available for the travel of the shuttle is uselessly shortened and the possible maximum performance of the loom reduced. V

According to the present invention these drawbacks are overcome by arranging that the double lever, pivoted to each of the slay swords, is arranged as a bell-crank lever with the obtuse angle between the arms facing and withthe arms of different length. is possible for the forward Hence it pause in the travel of i the slay to be shortened until it disappears completely, whereas the rear pause or the angular distance to be traversed bythe crank-shaft during this pause without the slay being moved, can be determined as required.

Fig. 1 gives a side elevation showing the construction of. the actuating mechanism acc'ording to the invention. 1 a

Fig. 2 shows, to a smaller scale, a schematic side elevation of the actuating mechanism at the commencementof the rear rest position.

' means of a pin 5. The ends of this double lever Fig. 3 illustrates the same device at the end of the rear rest position. f i

Fig. 4 indicates the forward stroke position of the slay.

The slay 2, which is connected to the reed I, is oscillatably carried, as usual, by the pivot 3. At the rear of each of the slay swords t, an angular double lever B, l, is pivotally mounted by are hinged by means of pins 8, 9 to the links or connecting rods 19 and II respectively, of two cranks which are arranged on the common crankmechanism driving 1 shaft,

f. crank-shaft. are engaged by connecting rodsor links from each .shown in Fig. 4 will however the crank-shaft can belengthened 7 8 claims. (a lies-19o) shaft i2, muaeaa suitableheight, behind th slay, in the frame of the loom. (not. shown) The crank lflgwhichacts on the upper short; arm

shaft. I 2 itself whereas the other one, :acting upon the. longer lower arm- 1 of the doubleilever, takes the form of i V proportions, shown in the drawing, the an le. of thebell-crank lever; open towardsthe crankshaft amounts to about vl2il'degree's, -.the bottom. 1' arm 1, of the -double lever is about three times as long as its upper arm 6, the crank-shaft being approximately on the same. level as the top end ofxthe latter, and the two cranks are displaced from each other byan angle of about 130 degrees, this will produce a pause when the slay reaches the rear limit of its travel, this pause lasting whilst the crank l3, during the rotation of the crank-shaft 12 in the direction of the arrow l5, traversesthe angular distance of about 120 degrees. between the positions shown in Figs. 2 and 3. The forward limit of stroke, be traversed by the If, according-Etc the slay without any pause, just as with any simple crank drive. a 7

During the pause in the backward stroke, which occupies a full third of the time of rotation of the crank and during which the slay finds itself in or. under the widest portion of thefully.

.ofqthe double lever, is yformed' by cr *nkingthelf angleccentricdisc I i, secured to ;-th e x open shed as shown in Figs. 2 and 3, it is pos", sible even in looms of very great weaving width, 2

to'pass the shuttle through the shed with less motional resistance. Seeing that owing to this. reduction in resistance, the mean speed of the shuttle may be considerably accelerated, without difficulty, this therefore admits of an ap-- preciable increase in the speedof rotation and in the efficiency of the loom.

, I claim: r I I 1. In a device for actuating the slay carrying the shuttle race and the reed'in mechanical looms, in combination with each of the two slay swords which support theslay pivotal about a horizontal axis; a bell crank lever having unequal arms pivotal'about a horizontal pin, a horizontal crank shaft carrying a pair of mu- I tually adjacent cranks and two connecting rods which join these cranks to pins arranged at the ends ofthe bell-crank lever.

2. In a device for actuating the slay carrying the shuttle race and the reed in mechanical looms, in combination with each of the two slay swords which support the slay pivotal about a horizontal axis," an unequal-armed bell-crank necting rod which lever oscillating about a horizontal pin, a horizontal crank-shaft carrying a pair of mutually adjacent cranks and two connecting rods which join these cranks to pins arranged at the ends of the bell-crank lever.

"3. In a device for actuating the slay carrying the shuttle race and the reed in mechanical looms, in combination with each of the two slay swords which support the slay pivotal about a horizontal axis; an unequal-armed bell-crank lever oscillating about a horizontal pin, a conconnects a pin of the short upper arm of the bell-crank lever to a crank of a horizontal crank-shaft and a connecting rod connecting a pin of the longer lower arm of the bell-crank lever to an eccentric disc mounted on the crank-shaft adjacent to the crank.

4. Actuating means for loom slay swords comprising a shaft having a pair of cranks, a bell crank lever pivoted at its angle to the slay swords and having its arms arranged at an obtuse angle with the end of one arm extending below the'shaft and the end of the other arm opposite the shaft, and links connecting said arms andcranks.

5. Actuating means for loom slay swords comprising a shaft having a pair of'cranks, a bell crank lever pivoted at its angle to the slay swords and having its arms arranged at an obtuse angle withthe end of one arm extending below the shaft and the end of the other arm opposite the shaft, said arms being inclined from the pivot towards the shaft, and links connecting said arms and cranks.

6. Actuating means for loom slay swords comprising a shaft having a pair of cranks, a bell crank lever pivoted at its angle to the slay swords and having its arms of unequal length and arranged at an obtuse angle with the end of one arm extending below the shaft and theend of the other arm opposite the shaft, and links connecting said arms and cranks.

'7. Actuating means for loom slay swords com prising a shaft having a pair of cranks, a bell crank lever pivoted at its angle to the slay swords and having its arms of unequal length and arranged at an obtuse angle with the end of one arm extending below the shaft and the end of the other arm opposite the shaft, said arms being inclined from the pivot towards the shaft,

and links connecting said arms and cranks.

8. Actuating means for loom slay swords comprising a bell crank lever pivoted at its angle to the slay swords and having its arms at an obtuse angle with one arm extending downwardly and the other arm extending upwardly, an actuating shaft with its axis of rotation located at the apex of the obtuse angle formed by extended center lines of said arms, a pair of angularly disposed cranks on said shaft, and links connecting said cranks with the ends of said arms.

PAUL BREDDIN. OT'I O WITTMERS. 

